System.Xml.Serialization.XmlSerializationWriter.GetQualifiedName C# (CSharp) Method

        private string GetQualifiedName(string name, string ns)
        {
            if (ns == null || ns.Length == 0) return name;
            string prefix = _w.LookupPrefix(ns);
            if (prefix == null)
            {
                if (ns == XmlReservedNs.NsXml)
                {
                    prefix = "xml";
                }
                else
                {
                    prefix = NextPrefix();
                    WriteAttribute("xmlns", prefix, null, ns);
                }
            }
            else if (prefix.Length == 0)
            {
                return name;
            }
            return prefix + ":" + name;
        }